📚 Year 8 OCR Computer Science: Quick Guide to Key Terms | Year 8 OCR 计算机：关键术语速记指南
In Year 8 OCR Computer Science, building a solid vocabulary is the first step towards understanding how computers work, how data is processed, and how networks operate. This guide breaks down essential terms into memorable chunks, using simple analogies and clever memory hooks. Whether you are revising for a test or trying to decode a textbook, these quick definitions and cross-language explanations will help you recall key concepts with confidence.
在 Year 8 OCR 计算机科学课程中，打好词汇基础是理解计算机工作原理、数据处理方式以及网络运作机制的第一步。本指南将关键术语分解成容易记忆的模块，搭配巧妙的联想提示和简洁类比。无论你是在备考复习，还是想读懂课本,这些快速定义与中英双语解释都能帮你牢固掌握核心概念。
1. Hardware Basics | 硬件基础
Hardware refers to the physical components of a computer you can touch. The most recognizable parts include the case, motherboard, central processing unit (CPU), random access memory (RAM) modules, power supply unit (PSU), and hard drive.
硬件指计算机中你可以触碰的物理部件。最常见的组件包括机箱、主板、中央处理器 (CPU)、内存条 (RAM)、电源 (PSU) 和硬盘。
The word ‘hardware’ splits into ‘hard’ (solid) and ‘ware’ (goods). Think of it as the solid tools of a computer, just like kitchen hardware includes pans and knives. A simple mnemonic: ‘Hardware = Hard things inside the machine.’
“Hardware” 这个词可以拆分为 “hard” (硬的) 和 “ware” (物品)。可以把它想象成计算机的固态工具，就像厨房用具包含锅和刀。简单口诀：”硬件就是机箱里看得见摸得着的东西”。
2. Input and Output Devices | 输入与输出设备
Input devices send data into the computer. Common examples are the keyboard, mouse, touchscreen, microphone, and scanner. The direction is always ‘into’ the system.
输入设备将数据送入计算机。常见例子有键盘、鼠标、触摸屏、麦克风和扫描仪。信号总是”进入”系统。
Output devices display or project data coming out of the computer. Monitors, printers, speakers, and headphones are all output devices. Remember ‘IN’ = send in, ‘OUT’ = send out. A quick trick: your eyes receive output from the monitor, your fingers give input through the keyboard.
输出设备显示或传出计算机送出的数据。显示器、打印机、扬声器和耳机都是输出设备。记住 “IN” 表示送入，”OUT” 表示送出。一个小技巧：眼睛接收来自显示器的输出，手指则通过键盘提供输入。
3. Software Categories | 软件分类
Software is a set of instructions that tells the hardware what to do. It is split into system software and application software. System software includes the operating system (like Windows, macOS, Linux) and utility programs that manage resources. Application software lets you perform specific tasks, such as word processing, web browsing, or playing games.
软件是一组告诉硬件该做什么的指令。它分为系统软件和应用软件。系统软件包含操作系统 (如 Windows、macOS、Linux) 和管理资源的实用程序。应用软件让你完成特定任务，如文字处理、浏览网页或玩游戏。
Think ‘soft’ as flexible code versus ‘hard’ fixed metal. The operating system is the manager; application software is the tool. A memory hook: ‘software = soft ideas running on hard metal.’
可以理解”软”指灵活的代码，对比”硬”的固定金属。操作系统是管理者；应用软件是工具。记忆口诀：”软件 = 在硬金属上运行的软想法”。
4. The Central Processing Unit (CPU) | 中央处理器
The CPU is often called the ‘brain’ of the computer. It fetches instructions from memory, decodes them, and executes them in a continuous cycle. The main parts inside a CPU are the arithmetic logic unit (ALU), which performs calculations, and the control unit (CU), which orchestrates the fetch-decode-execute rhythm.
CPU 常常被称为计算机的”大脑”。它在不断的循环中从内存取指令、解码指令并执行指令。CPU 内部的主要部件是负责运算的算术逻辑单元 (ALU) 和协调取指-解码-执行节奏的控制单元 (CU)。
CPU speed is measured in gigahertz (GHz) – billions of cycles per second. A 3.5 GHz CPU can handle 3.5 billion instruction cycles each second. Remember: ‘Central’ means it is the central boss; ‘Processing’ means it thinks and calculates.
CPU 速度以吉赫兹 (GHz) 为单位,即每秒数十亿个周期。一颗 3.5 GHz 的 CPU 每秒可以处理 35 亿个指令周期。记住：”中央”表示它是核心主管；”处理器”表示它负责思考和计算。
5. Memory and Storage | 内存与存储
Primary memory consists of RAM (Random Access Memory) and ROM (Read Only Memory). RAM is volatile, meaning it loses its content when the power is turned off; it acts as the computer’s temporary workspace. ROM is non-volatile and usually stores the boot-up instructions that start the computer.
主存储器包括 RAM (随机存取存储器) 和 ROM (只读存储器)。RAM 是易失性的，断电后内容丢失；它是计算机的临时工作区。ROM 是非易失性的，通常存放启动计算机所需的引导指令。
Secondary storage holds data permanently. Hard disk drives (HDD) use spinning magnetic platters, while solid-state drives (SSD) use flash memory with no moving parts. USB flash drives and memory cards are also secondary storage. A helpful analogy: RAM is your desk where you work, storage is the filing cabinet where you keep finished projects.
辅助存储器永久保存数据。硬盘驱动器 (HDD) 使用旋转的磁盘片，而固态驱动器 (SSD) 使用没有可动部件的闪存。U 盘和存储卡也是辅助存储器。有用类比：RAM 是你工作的桌面，存储器则是存放完工项目的文件柜。
6. Binary and Data Representation | 二进制与数据表示
Computers use binary, a base-2 number system made up of only 1s and 0s. Each 1 or 0 is called a bit (binary digit). A group of 8 bits forms a byte, which can represent 256 different values from 00000000 to 11111111.
计算机使用二进制，一种仅由 1 和 0 组成的基数为 2 的数字系统。每个 1 或 0 称为一个比特 (二进制位)。8 个比特组成一个字节，可以表示从 00000000 到 11111111 共 256 种不同的值。
Characters are represented using binary codes, most commonly the ASCII standard where ‘A’ is 65 (denary) or 01000001 in binary. The word ‘binary’ comes from the Latin ‘bini’, meaning two. Simply remember: ‘binary = bi (two) + nary (number system).’
字符使用二进制码表示，最常见的是 ASCII 标准，其中 ‘A’ 对应十进制 65 或二进制 01000001。”Binary” 一词源自拉丁语 “bini”，意为两个。简单记忆：”binary = bi (二) + nary (数制)”。
7. Algorithms and Flowcharts | 算法与流程图
An algorithm is a precise, step-by-step set of instructions to solve a problem or complete a task. It must be unambiguous and eventually finish. Real-life examples include a cooking recipe or a set of directions to a friend’s house.
算法是一组精确的、步骤清晰的指令，用于解决问题或完成任务。它必须明确无误且最终会结束。现实生活中的例子包括烹饪食谱或去朋友家的路线指引。
Flowcharts visualise algorithms using standard symbols: an oval for Start/End, a rectangle for a process (e.g., ‘Add 1 to score’), a diamond for a decision (Yes/No), and a parallelogram for input/output. The arrows show the direction of flow. A memory aid: ‘Oval = open and close, Diamond = decide, Rectangle = recalulate.’
流程图用标准符号将算法可视化：椭圆形表示开始/结束，矩形表示过程 (如”分数加 1″)，菱形表示判断 (是/否)，平行四边形表示输入/输出。箭头指示流程方向。记忆法：”椭圆开关门，菱形做判断，矩形搞计算”。
8. Programming Concepts | 编程概念
Variables are named storage locations whose values can change while a program runs. Constants are similar but their values stay the same. Common data types include integer (whole number), float (decimal number), string (text), and Boolean (True/False).
变量是命名的存储位置，其值可在程序运行时改变。常量类似但值保持不变。常见的数据类型包括整型 (整数)、浮点型 (小数)、字符串 (文本) 和布尔型 (真/假)。
Programs follow three fundamental control structures: sequence (executing instructions in order), selection (making a choice using if-else statements), and iteration (repeating a block of code with for or while loops). To remember: ‘Sequence = step by step, Selection = choose the path, Iteration = loop back again.’
程序遵循三种基本的控制结构：顺序 (按顺序执行指令)、选择 (使用 if-else 语句做出选择) 和迭代 (使用 for 或 while 循环重复代码块)。记忆口诀：”顺序一步步，选择分岔路，迭代回头走”。
| English Term | 中文术语 | Quick Meaning |
|---|---|---|
| Variable | 变量 | A container that stores a value that can change |
| If-else | 如果-否则 | Makes a decision; runs different code depending on a condition |
| For loop | For 循环 | Repeats code a set number of times |
9. Networks and the Internet | 网络与互联网
A LAN (Local Area Network) connects computers in a small area such as a school or home. A WAN (Wide Area Network) connects LANs over large geographical distances; the Internet is the biggest WAN. Hardware includes switches (connect devices within a LAN) and routers (direct traffic between networks).
局域网 (LAN) 连接一个小区域 (如学校或家庭) 内的计算机。广域网 (WAN) 将分布在不同地理范围的局域网连接起来；互联网就是最大的广域网。硬件包括交换机 (在局域网内连接设备) 和路由器 (在网络之间引导数据流)。
The World Wide Web (WWW) is a collection of webpages accessed using HTTP or HTTPS. Every device on the Internet has an IP address, a unique numerical label. DNS (Domain Name System) translates readable website names like ‘aleveler.com’ into IP addresses. Remember: ‘Internet = global cables, Web = pages you see, IP = digital postcode, DNS = phonebook for websites.’
万维网 (WWW) 是使用 HTTP 或 HTTPS 访问的网页集合。互联网上的每台设备都有一个唯一的数字标签 IP 地址。DNS (域名系统) 将 “aleveler.com” 这样的可读网站名称转换成 IP 地址。记住：”互联网 = 全球管道，Web = 你看到的页面，IP = 数字邮编，DNS = 网站电话本”。
10. Data Units and File Sizes | 数据单位与文件大小
Data size grows by factors of 2¹⁰ (1024) in computer science. The smallest unit is a bit, then a nibble (4 bits), a byte (8 bits), kilobyte (KB, 1024 bytes), megabyte (MB, 1024 KB), gigabyte (GB, 1024 MB), and terabyte (TB, 1024 GB).
在计算机科学中，数据大小按 2¹⁰ (1024) 的倍数增长。最小单位是比特，然后是半字节 (4 比特)、字节 (8 比特)、千字节 (KB, 1024 字节)、兆字节 (MB, 1024 KB)、吉字节 (GB, 1024 MB) 和太字节 (TB, 1024 GB)。
A useful hint: the prefixes kilo-, mega-, giga-, and tera- come from Greek and mean thousand, million, billion, and trillion, but in computing they are based on 1024, not 1000. An MP3 song is about 4 MB; a high-definition movie can be 4 GB.
实用提示：前缀 kilo-, mega-, giga- 和 tera- 来自希腊语，分别表示千、百万、十亿和万亿，但在计算机中基于 1024 而非 1000。一首 MP3 歌曲大约 4 MB；一部高清电影可能达到 4 GB。
| Unit | Abbreviation | Equivalent |
|---|---|---|
| Bit | b | Single 0 or 1 |
| Byte | B | 8 bits |
| Kilobyte | KB | 1024 bytes |
| Megabyte | MB | 1024 KB |
| Gigabyte | GB | 1024 MB |
11. Cybersecurity and Safety | 网络安全与安全
Malware is malicious software including viruses (attach to programs), worms (self-replicate across networks), and trojans (disguise themselves as useful software). A firewall monitors incoming and outgoing traffic and blocks suspicious connections. Encryption scrambles data so only authorised users can read it.
恶意软件 (malware) 包括病毒 (附着于程序)、蠕虫 (在网络上自我复制) 和特洛伊木马 (伪装成有用软件)。防火墙监视进出流量并阻止可疑连接。加密会将数据打乱，使得只有授权用户才能解读。
Phishing is a social engineering attack where fake emails or messages trick you into revealing passwords or personal details. The word plays on ‘fishing’ – attackers bait victims. Always use strong passwords with a mix of letters, numbers, and symbols, and never share them.
网络钓鱼 (phishing) 是一种社会工程攻击，通过虚假邮件或消息诱骗你泄露密码或个人信息。这个词玩的是 “fishing” (钓鱼) 的谐音——攻击者用诱饵引受害者上钩。始终使用包含字母、数字和符号的混合强密码，并绝不要与他人分享。
12. Ethics and Legal Issues | 伦理与法律问题
Copyright protects the creator’s original work; you cannot copy, distribute, or use it without permission. Plagiarism means taking someone else’s work or ideas and presenting them as your own. In computing, this applies to code, images, and written content.
版权保护创作者的原创作品；未经许可，你不能复制、分发或使用这些作品。剽窃是指把他人的作品或想法当作自己的来呈现。在计算机领域，这适用于代码、图片和文字内容。
Data protection laws, such as the GDPR in Europe, require organisations to handle personal data fairly and keep it secure. An acceptable use policy (AUP) is a set of rules schools or companies set for using their network and devices responsibly. Think ‘copyright = right to copy is limited, plagiarise = pretend it’s yours, AUP = rules of the digital playground.’
数据保护法，例如欧洲的 GDPR，要求机构公平地处理个人数据并保证其安全。可接受使用政策 (AUP) 是学校或公司为负责任地使用网络和设备而制定的一套规则。可以这样记：”版权 = 复制权有限，剽窃 = 假装是你的，AUP = 数字游乐场规则”。
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